Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sunscreens with Benzophenone-3 Unsuitable for Children

06.11.2006
Sunscreens that contain benzophenone-3 provide effective protection against both UVA and UVB radiation, but these preparations should not be used for young children. The substance can be found in the urine of adults several days after coming home from a holiday in the sun. A doctoral thesis from the Sahlgrenska Academy in Sweden has recently presented these results.

Benzophenone-3 provides effective protection against both UVA and UVB radiation. The substance has been available since the 1980s.

“There has been a certain amount of discussion about Benzophenone-3, and it is for this reason not common in Swedish sunscreens. This is a shame, since there are few substances that protect as effectively against UVA radiation”, says dermatologist Helena Gonzalez.

It is known that benzophenone-3 can cause contact eczema, but there is limited knowledge about other adverse effects.

Helena Gonzalez carried out a study in which 26 people applied sunscreen containing 4% benzophenone-3 to the complete skin morning and evening for five days. These people supplied a urine specimen every day.

“We designed the study such that it was similar to what is normal when people take a normal holiday in the sun”, says Helena Gonzalez.

The subjects continued to provide urine specimens after they stopped applying the sunscreen. The urine still contained benzophenone-3 five days after stopping using the sunscreen, a result that suggests that the substance is being stored in the body. The average total amount of benzophenone-3 excreted was 3.7%.

“We don’t know how long it is stored, and we don’t known whether it is important, but I suggest that parents of small children should avoid using sunscreens that contain benzophenone-3, to be on the safe side”, says Helena Gonzalez.

Children under the age of two years have not fully developed the enzymes that are believed to break down benzophenone-3. This suggests, in theory, that small children will not be able to get rid of the substance as easily as adults.

The thesis also shows that several common sunscreens break down under the action of sunlight. Several sunscreens that are readily available in the shops were tested, and their photostabilities were measured after 30, 90 and 120 minutes. The protection against UVA radiation deteriorated by more than 20% for three of these sunscreens. This deterioration took place for one sunscreen after only 30 minutes.

“The principal protection against the harmful effects of the sun should be clothes,” says Helena Gonzalez, “and sunscreens should be used solely as a supplement.”

Some of the commercial sunscreens have changed their composition after the test was carried out, and it is not known whether the new formula has better photostability than the old.

Thesis presented for the title Doctor of Medicine at the Sahlgrenska Academy, Department of Clinical Sciences, Department of Dermatology and Venereology

The title of the thesis: Studies of Sunscreens: Percutaneous Absorption of Benzophenone-3 and Photostability

The thesis will be defended on Friday 10 November, 9.00 a.m., Lecture Theatre “Arvid Carlsson”, Academicum, Medicinaregatan 3, Göteborg, Sweden.

Elin Lindström Claessen | alfa
Further information:
http://www.sahlgrenska.gu.se

More articles from Health and Medicine:

nachricht Team discovers how bacteria exploit a chink in the body's armor
20.01.2017 | University of Illinois at Urbana-Champaign

nachricht Rabies viruses reveal wiring in transparent brains
19.01.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>